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Lamma Power Station Solar Power System
2
Content
Project Background
Site Selection
Amorphous Silicon Thin Film Photovoltaic System
Environmental Benefits
Challenges
Project Schedule
Summary and Way Forward
3
Project Background To widen the use of renewable energy in
HK Electric’s power generation system in support of government policy.
To explore the introduction of commercial scale solar energy project following the success of commissioning the first wind turbine in providing green electricity.
To partner with DuPont Apollo Limited in studying the feasibility of installing large scale PV System in Lamma Power Station.
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Site Selection - Considerations Large flat area for solar PV
installation on ground or roof top
The total weight of solar panels and supports against allowable roof loading
Orientation of solar panels – facing south and tilted at 22º
Full utilization of sunlight with no shading
Visual impact
Ease of grid connection
Accessibility for operation & maintenance
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Site Selection - Installation Locations5 groups on rooftops of Main Station Building & 1 group near C.W. Intake no. 2
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Amorphous silicon photovoltaic module – 5,500 pieces
Total Area of PV modules – 8470 m²
Maximum output of each PV module – 100 W
Total installed Capacity – 550 kW
Capacity Factor – 12.9%
Anticipated power output – 620,000 kWh
Design life – 20 years
Project Cost – HK$23 million
Amorphous Silicon Thin Film PV System – Technical Information
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Amorphous Silicon Thin Film PV System – Characteristics and Benefits1. Use less energy for production
The more silicon is used for production of PV panels, the more energy is required. Thin film PV technology uses less silicon. Thickness is only about 1/200 of that for crystalline PV module.
2. More suitable in tropical environment
Thin film PV maintains better power output level at high temperature than crystalline PV.
3. Better weak light performance
Thin film PV modules are able to effectively produce power at low irradiance conditions.
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Amorphous Silicon Thin Film PV System – Power output in response to solar irradiance variation
Power Output: 18/7/2010 (Sunny) – 3,582 kWh, 22/7/2010 (Cloudy & Rainy) – 1,258 kWh
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● Fully Automatic Operation
With solar irradiance of 100 W/m² and the output voltage of PV
string at 360V, the system connects to the grid automatically.
● Simple Maintenance
General cleaning required under normal circumstances.
Power output not affected even with minor cracks on surface of PV
modules.
Amorphous Silicon Thin Film PV System – Operation & Maintenance
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Environmental Benefits
Reduce 520 tonnes of CO2 emission per annum
Reduce 2.9 tonnes of SO2 emission per annum
Reduce 1.4 tonnes of
NOx emission per annum
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Challenges1. Retrofitting large scale solar power system in existing power plant
– locating large flat areas without any shade to set up PV modules, while not affecting plant operations.
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Typical HK Electric’s Solar Power System
Mounting of modules
Metal structure fixed by anchored bolts
Concrete blocks freely stand on the roof to avoid damage to water-proofing layers
Wind Pressure
2.4 kPa / m²
(No stiffeners)
5.6 kPa / m²(Stiffeners added)
Challenges2. Mounting the PV panels firmly at the selected sites without damaging
water-proofing layers on rooftops and wind pressure on PV panels.
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Challenges3. Delivering large quantities of equipment and materials to rooftops.
11,000 concrete blocks for fixing of PV modules
5,500 Solar Panels47 PV inverters, 47 combiner boxes, 25 Electrical and instrument panels
100,000 metres of cables and cable supports 21,888 angle steel brackets for fixing of PV modules onto the concrete blocks
250 Ton crane for lifting of materials to EL+80.15 roof areas
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4 – 9/2009 Site investigation and study
10 & 11/2009 Tendering
12/2009 – 3/2010 Design
4 – 6/2010 Construction, testing & commissioning
End 6/2010 Project Completion
Project Schedule
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Summary and Way Forward
550 kW
Lamma Power Station
Completed in 2010
Amorphous Silicon Thin Film
350 kW
EMSD Headquarter
Completed in 2005
Crystalline Silicon
198 kW
Hong Kong Science Park
Completed in 2005
Crystalline Silicon
● It is the largest solar energy system in Hong Kong.● More solar panels are planned to be installed on the rooftops of the
New Store Building and existing 275 kV Switching Station. ● The long term target is to expand the total capacity of the system to
1 MW.
Thank You